I work in the Technology department of a global company (15,000 employees, I've worked there for 30 years)
In December '15 I told my immediate manager and a few very dear friends
In September '16 I told my HR rep.
In I told the rest of my team (4 other people) in Dec '16
HR told (at my request) the CTO (and his direct reports) Feb 20 '17
Over the next three or four days I received dozens of "congratulations" emails.
Thursday, March 2nd @ 5 pm - I replaced my nameplate
Friday, March 3rd, working from home, I changed my Preferred Name in the email system.
Monday, March 6th, Denise went to work. (My HR rep stopped off at 8:00 am to make sure I was okay)
Since then I've had..... ZERO issues, ZERO negative comments. I've heard (through a third party) that one woman on the floor was 'uncomfortable' with the bathroom situation. To which I replied - I'll not use the restroom on the next floor down. If they are uncomfortable, they can go down one floor.
Basically, I was surprised how much of a non-event it was.